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1 | /* |
2 | * max1619.c - Part of lm_sensors, Linux kernel modules for hardware |
3 | * monitoring |
4 | * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru> |
5 | * Jean Delvare <khali@linux-fr.org> |
6 | * |
7 | * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim. |
8 | * It reports up to two temperatures (its own plus up to |
9 | * one external one). Complete datasheet can be |
10 | * obtained from Maxim's website at: |
11 | * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf |
12 | * |
13 | * This program is free software; you can redistribute it and/or modify |
14 | * it under the terms of the GNU General Public License as published by |
15 | * the Free Software Foundation; either version 2 of the License, or |
16 | * (at your option) any later version. |
17 | * |
18 | * This program is distributed in the hope that it will be useful, |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
21 | * GNU General Public License for more details. |
22 | * |
23 | * You should have received a copy of the GNU General Public License |
24 | * along with this program; if not, write to the Free Software |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
26 | */ |
27 | |
28 | |
29 | #include <linux/module.h> |
30 | #include <linux/init.h> |
31 | #include <linux/slab.h> |
32 | #include <linux/jiffies.h> |
33 | #include <linux/i2c.h> |
34 | #include <linux/hwmon.h> |
35 | #include <linux/hwmon-sysfs.h> |
36 | #include <linux/err.h> |
37 | #include <linux/mutex.h> |
38 | #include <linux/sysfs.h> |
39 | |
40 | static const unsigned short normal_i2c[] = { |
41 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
42 | |
43 | /* |
44 | * The MAX1619 registers |
45 | */ |
46 | |
47 | #define MAX1619_REG_R_MAN_ID 0xFE |
48 | #define MAX1619_REG_R_CHIP_ID 0xFF |
49 | #define MAX1619_REG_R_CONFIG 0x03 |
50 | #define MAX1619_REG_W_CONFIG 0x09 |
51 | #define MAX1619_REG_R_CONVRATE 0x04 |
52 | #define MAX1619_REG_W_CONVRATE 0x0A |
53 | #define MAX1619_REG_R_STATUS 0x02 |
54 | #define MAX1619_REG_R_LOCAL_TEMP 0x00 |
55 | #define MAX1619_REG_R_REMOTE_TEMP 0x01 |
56 | #define MAX1619_REG_R_REMOTE_HIGH 0x07 |
57 | #define MAX1619_REG_W_REMOTE_HIGH 0x0D |
58 | #define MAX1619_REG_R_REMOTE_LOW 0x08 |
59 | #define MAX1619_REG_W_REMOTE_LOW 0x0E |
60 | #define MAX1619_REG_R_REMOTE_CRIT 0x10 |
61 | #define MAX1619_REG_W_REMOTE_CRIT 0x12 |
62 | #define MAX1619_REG_R_TCRIT_HYST 0x11 |
63 | #define MAX1619_REG_W_TCRIT_HYST 0x13 |
64 | |
65 | /* |
66 | * Conversions |
67 | */ |
68 | |
69 | static int temp_from_reg(int val) |
70 | { |
71 | return (val & 0x80 ? val-0x100 : val) * 1000; |
72 | } |
73 | |
74 | static int temp_to_reg(int val) |
75 | { |
76 | return (val < 0 ? val+0x100*1000 : val) / 1000; |
77 | } |
78 | |
79 | /* |
80 | * Functions declaration |
81 | */ |
82 | |
83 | static int max1619_probe(struct i2c_client *client, |
84 | const struct i2c_device_id *id); |
85 | static int max1619_detect(struct i2c_client *client, |
86 | struct i2c_board_info *info); |
87 | static void max1619_init_client(struct i2c_client *client); |
88 | static int max1619_remove(struct i2c_client *client); |
89 | static struct max1619_data *max1619_update_device(struct device *dev); |
90 | |
91 | /* |
92 | * Driver data (common to all clients) |
93 | */ |
94 | |
95 | static const struct i2c_device_id max1619_id[] = { |
96 | { "max1619", 0 }, |
97 | { } |
98 | }; |
99 | MODULE_DEVICE_TABLE(i2c, max1619_id); |
100 | |
101 | static struct i2c_driver max1619_driver = { |
102 | .class = I2C_CLASS_HWMON, |
103 | .driver = { |
104 | .name = "max1619", |
105 | }, |
106 | .probe = max1619_probe, |
107 | .remove = max1619_remove, |
108 | .id_table = max1619_id, |
109 | .detect = max1619_detect, |
110 | .address_list = normal_i2c, |
111 | }; |
112 | |
113 | /* |
114 | * Client data (each client gets its own) |
115 | */ |
116 | |
117 | struct max1619_data { |
118 | struct device *hwmon_dev; |
119 | struct mutex update_lock; |
120 | char valid; /* zero until following fields are valid */ |
121 | unsigned long last_updated; /* in jiffies */ |
122 | |
123 | /* registers values */ |
124 | u8 temp_input1; /* local */ |
125 | u8 temp_input2, temp_low2, temp_high2; /* remote */ |
126 | u8 temp_crit2; |
127 | u8 temp_hyst2; |
128 | u8 alarms; |
129 | }; |
130 | |
131 | /* |
132 | * Sysfs stuff |
133 | */ |
134 | |
135 | #define show_temp(value) \ |
136 | static ssize_t show_##value(struct device *dev, struct device_attribute *attr, \ |
137 | char *buf) \ |
138 | { \ |
139 | struct max1619_data *data = max1619_update_device(dev); \ |
140 | return sprintf(buf, "%d\n", temp_from_reg(data->value)); \ |
141 | } |
142 | show_temp(temp_input1); |
143 | show_temp(temp_input2); |
144 | show_temp(temp_low2); |
145 | show_temp(temp_high2); |
146 | show_temp(temp_crit2); |
147 | show_temp(temp_hyst2); |
148 | |
149 | #define set_temp2(value, reg) \ |
150 | static ssize_t set_##value(struct device *dev, struct device_attribute *attr, \ |
151 | const char *buf, \ |
152 | size_t count) \ |
153 | { \ |
154 | struct i2c_client *client = to_i2c_client(dev); \ |
155 | struct max1619_data *data = i2c_get_clientdata(client); \ |
156 | long val; \ |
157 | int err = kstrtol(buf, 10, &val); \ |
158 | if (err) \ |
159 | return err; \ |
160 | \ |
161 | mutex_lock(&data->update_lock); \ |
162 | data->value = temp_to_reg(val); \ |
163 | i2c_smbus_write_byte_data(client, reg, data->value); \ |
164 | mutex_unlock(&data->update_lock); \ |
165 | return count; \ |
166 | } |
167 | |
168 | set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW); |
169 | set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH); |
170 | set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT); |
171 | set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST); |
172 | |
173 | static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, |
174 | char *buf) |
175 | { |
176 | struct max1619_data *data = max1619_update_device(dev); |
177 | return sprintf(buf, "%d\n", data->alarms); |
178 | } |
179 | |
180 | static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, |
181 | char *buf) |
182 | { |
183 | int bitnr = to_sensor_dev_attr(attr)->index; |
184 | struct max1619_data *data = max1619_update_device(dev); |
185 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); |
186 | } |
187 | |
188 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); |
189 | static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); |
190 | static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, |
191 | set_temp_low2); |
192 | static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, |
193 | set_temp_high2); |
194 | static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, |
195 | set_temp_crit2); |
196 | static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2, |
197 | set_temp_hyst2); |
198 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
199 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); |
200 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
201 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
202 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); |
203 | |
204 | static struct attribute *max1619_attributes[] = { |
205 | &dev_attr_temp1_input.attr, |
206 | &dev_attr_temp2_input.attr, |
207 | &dev_attr_temp2_min.attr, |
208 | &dev_attr_temp2_max.attr, |
209 | &dev_attr_temp2_crit.attr, |
210 | &dev_attr_temp2_crit_hyst.attr, |
211 | |
212 | &dev_attr_alarms.attr, |
213 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
214 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
215 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
216 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
217 | NULL |
218 | }; |
219 | |
220 | static const struct attribute_group max1619_group = { |
221 | .attrs = max1619_attributes, |
222 | }; |
223 | |
224 | /* |
225 | * Real code |
226 | */ |
227 | |
228 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
229 | static int max1619_detect(struct i2c_client *client, |
230 | struct i2c_board_info *info) |
231 | { |
232 | struct i2c_adapter *adapter = client->adapter; |
233 | u8 reg_config, reg_convrate, reg_status, man_id, chip_id; |
234 | |
235 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
236 | return -ENODEV; |
237 | |
238 | /* detection */ |
239 | reg_config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); |
240 | reg_convrate = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONVRATE); |
241 | reg_status = i2c_smbus_read_byte_data(client, MAX1619_REG_R_STATUS); |
242 | if ((reg_config & 0x03) != 0x00 |
243 | || reg_convrate > 0x07 || (reg_status & 0x61) != 0x00) { |
244 | dev_dbg(&adapter->dev, "MAX1619 detection failed at 0x%02x\n", |
245 | client->addr); |
246 | return -ENODEV; |
247 | } |
248 | |
249 | /* identification */ |
250 | man_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_MAN_ID); |
251 | chip_id = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CHIP_ID); |
252 | if (man_id != 0x4D || chip_id != 0x04) { |
253 | dev_info(&adapter->dev, |
254 | "Unsupported chip (man_id=0x%02X, chip_id=0x%02X).\n", |
255 | man_id, chip_id); |
256 | return -ENODEV; |
257 | } |
258 | |
259 | strlcpy(info->type, "max1619", I2C_NAME_SIZE); |
260 | |
261 | return 0; |
262 | } |
263 | |
264 | static int max1619_probe(struct i2c_client *new_client, |
265 | const struct i2c_device_id *id) |
266 | { |
267 | struct max1619_data *data; |
268 | int err; |
269 | |
270 | data = devm_kzalloc(&new_client->dev, sizeof(struct max1619_data), |
271 | GFP_KERNEL); |
272 | if (!data) |
273 | return -ENOMEM; |
274 | |
275 | i2c_set_clientdata(new_client, data); |
276 | data->valid = 0; |
277 | mutex_init(&data->update_lock); |
278 | |
279 | /* Initialize the MAX1619 chip */ |
280 | max1619_init_client(new_client); |
281 | |
282 | /* Register sysfs hooks */ |
283 | err = sysfs_create_group(&new_client->dev.kobj, &max1619_group); |
284 | if (err) |
285 | return err; |
286 | |
287 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
288 | if (IS_ERR(data->hwmon_dev)) { |
289 | err = PTR_ERR(data->hwmon_dev); |
290 | goto exit_remove_files; |
291 | } |
292 | |
293 | return 0; |
294 | |
295 | exit_remove_files: |
296 | sysfs_remove_group(&new_client->dev.kobj, &max1619_group); |
297 | return err; |
298 | } |
299 | |
300 | static void max1619_init_client(struct i2c_client *client) |
301 | { |
302 | u8 config; |
303 | |
304 | /* |
305 | * Start the conversions. |
306 | */ |
307 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, |
308 | 5); /* 2 Hz */ |
309 | config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); |
310 | if (config & 0x40) |
311 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, |
312 | config & 0xBF); /* run */ |
313 | } |
314 | |
315 | static int max1619_remove(struct i2c_client *client) |
316 | { |
317 | struct max1619_data *data = i2c_get_clientdata(client); |
318 | |
319 | hwmon_device_unregister(data->hwmon_dev); |
320 | sysfs_remove_group(&client->dev.kobj, &max1619_group); |
321 | |
322 | return 0; |
323 | } |
324 | |
325 | static struct max1619_data *max1619_update_device(struct device *dev) |
326 | { |
327 | struct i2c_client *client = to_i2c_client(dev); |
328 | struct max1619_data *data = i2c_get_clientdata(client); |
329 | |
330 | mutex_lock(&data->update_lock); |
331 | |
332 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { |
333 | dev_dbg(&client->dev, "Updating max1619 data.\n"); |
334 | data->temp_input1 = i2c_smbus_read_byte_data(client, |
335 | MAX1619_REG_R_LOCAL_TEMP); |
336 | data->temp_input2 = i2c_smbus_read_byte_data(client, |
337 | MAX1619_REG_R_REMOTE_TEMP); |
338 | data->temp_high2 = i2c_smbus_read_byte_data(client, |
339 | MAX1619_REG_R_REMOTE_HIGH); |
340 | data->temp_low2 = i2c_smbus_read_byte_data(client, |
341 | MAX1619_REG_R_REMOTE_LOW); |
342 | data->temp_crit2 = i2c_smbus_read_byte_data(client, |
343 | MAX1619_REG_R_REMOTE_CRIT); |
344 | data->temp_hyst2 = i2c_smbus_read_byte_data(client, |
345 | MAX1619_REG_R_TCRIT_HYST); |
346 | data->alarms = i2c_smbus_read_byte_data(client, |
347 | MAX1619_REG_R_STATUS); |
348 | |
349 | data->last_updated = jiffies; |
350 | data->valid = 1; |
351 | } |
352 | |
353 | mutex_unlock(&data->update_lock); |
354 | |
355 | return data; |
356 | } |
357 | |
358 | module_i2c_driver(max1619_driver); |
359 | |
360 | MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and " |
361 | "Jean Delvare <khali@linux-fr.org>"); |
362 | MODULE_DESCRIPTION("MAX1619 sensor driver"); |
363 | MODULE_LICENSE("GPL"); |
364 |
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